Hitchhikers Guide to the Galaxy

Yesterday I went to the Hitchhikers Guide to the Galaxy movie, which opened wednesday. I was a little afraid it might not be that good because it was produced by Americans, but the English style of humor is well preserved, so I really liked the movie. I only knew it from the TV-series I've seen a few years ago. I heard that the radioshow, the book and the TV-series are a little different, maybe the movie is also different.